Your best bet is to contact the company who ran the
KS
(they may have a contact email address on the front page, or if not via the contact me link on the right, for ghostbusters boardgame try
ghostbusters@cryptozoic.com)
as Absolutionist has said some companies will allow people in after the
KS (eg CMON), some allow them in but charge a higher price (Reaper) and some won't take late pledges
all you can do is ask